Lotus Elan

Rear Disc thickness, any new knowledge?

PostPost by: robertverhey » Fri Mar 08, 2013 1:08 pm

Hi I've just noticed, now that the body's off, that the two rear discs are quite different in thickness.....O/S is 5.5mm and N/S is 11.4mm
that's too much difference to be put down to wear....clearly they are different parts. And will be unacceptable to use together.

Can anyone advise which is more likely to be the correct thickness?

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PostPost by: peterako » Fri Mar 08, 2013 2:03 pm

Recently picked up some NOS rear discs from FleaBay.

Both were in and around the 11.5mm range.

5.5mm seems like it may be a one of those CD Music type discs.... :)

Even my badly worn discs that I took off teh car were around 9mm.

I is an Inginear....please excuse my speeling!
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PostPost by: oldelanman » Fri Mar 08, 2013 3:44 pm

The new discs I bought from one of the usual UK suspects are 10mm thick and the ones I took off which are rust pitted but not heavily worn measure around 9.5mm.

Either way your 5.5mm disc is certainly not right - it's way below the 8.3mm which I believe is the recommended MIN wear limit.
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PostPost by: john.p.clegg » Fri Mar 08, 2013 4:02 pm

....aaah but just think of the unsprung weight saving....

John :wink:
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